Cochin University of Science and Techology (CUST) 2006 B.Tech Civil Engineering Fundamentals of Engineering II - Question Paper
With the help of suitable diagrams explain amplitude modulation, and define modulation index.
Compare the performance of AM and FM.
What are the advantages of digital communication over analog communication ? Give one example of a Digital Communication System.
Code No. BTS 044
B.Tech. Degree (F.T) I & II Semesteti combined) Examination in Information Technology/Computer Science and Engineering/Electronics and Communication Engineering/Civil Engineering/MechanicalEngineering/ Safety and Fire Engineering/Electronics and InstrumentationEngineering/ Biomedical Engineering and (P.T) in Electronics and Communication Engineering, June 2000
IT/CS/EC/CE/ME/SE/EI/BE 108 FUNDAMENTALS OF
ENGINEERING - II
Time: 3 Hours Max. Marks: 100
(Answer all questions. All questions carry equal marks)
PART-A
I a) State and explain Kirchhoff s current law and voltage law. (S)
b) In the following circuit find the current through the 6C2
(h2/3)
resistor using the voltage divider principle.
II a) How will you represent ideal and practical current
sources. (4)
b) What are the steps to be followed to arrive at a
(i) Thevanin equivalent circuit (ii) Norton equivalent circuit of a network. (122/3)
(P.T.O)
III a) State and explain Faraday's and Lenzs laws. (lO2)
b) Define (i) self-induced emf (ii) mutually induced emf
(iii) coefficient of coupling. (6)
OR
IV a) What are the different types of ammeters used for current
measurement ? Explain any one type with suitable diagrams. (ll2/3)
b) An air-cored toroidal coil has 450 turns and a mean
diameter of 30 cm and a cross-sectional area of 3 cap-. Calculate (i) the inductance of the coil
(ii) the average emf induced if a current of 2A is reversed in 0.04 second. (5)
V a) Draw a general sinusoid whose equation is given by
#(/) = Vm sin(wt - 0,) and find expressions for average value, rms value, with the negative value clipped, but with conduction in both half-cycles. (12)
b) > Define lagging and leading power factor. (42/3)
OR
VI a) Draw a series RLC circuit and explain how resonance
is achieved in such a circuit (10)
b) Compare single and three phase supply systems. (3)
c) Compare the features of star and delta connections. (32/3)
PART-B
VII a) Explain with the help of neat sketches, the energy-band
diagram of a semiconductor pn junction under equilibrium, when forward biased and reverse biased. (lO2)
Differentiate between avalanche breakdown and zener breakdown. (3)
The breakdown voltage of a zener diode is 15V. If the maximum power rating of the diode is 500mW find the maximum current. (3)
c)
VIII a) b)
c)
IX a)
OR
Draw neat diagrams of the input and output characteristics of an NPN transistor in the CB, CE and CC configurations. (9)
Draw the circuit diagrams and waveforms of a ftill-wave
rectifier using two diodes without and with capacitor
filter. (42/3)
Give four advantages of full-wave rectifier over half-wave rectifier. (3)
Explain with neat sketches, the principle of operation of a silicon controlled rectifier. Why there is no Ge controlled rectifier. (10
What are LED's made of ? How do you get different colour LEDs? (6)
b)
X a) b)
XI a)
OR
Draw the block diagram of a CRO and explain each block. Give three applications of CROs. (122/3)
Give cie typical example of a transducer for each of the following meassurements.
(i) pressure (ii) velocity
(iii) vibration (iv) temperature. (4)
What is the need for modulation in communication. (42/3)
Contd...4
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